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TO36 Guitar String Action Ruler Gauge Guitar Luthier Tool

Great pocket sized durable stainless steel rule
guide for setting the action on any stringed instrument.
The gauge features a progressive string height scale:
simply slide it across the frets and read the measurement under the string.
It’s faster to use than any ruler, and stays parallel to the
fingerboard—much easier than trying to hold a ruler perpendicular to a rounded fret.

The string height markers are graduated from:
INCH side .010” to .140” on the inch model,
METRIC side from 0.25mm to 3.50mm